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HBase >> mail # dev >> metrics / performance impact


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Re: metrics / performance impact
That's really weird.  All of those metrics were basically direct copies of
what was there in 0.94 but using metrics2 to export things.  Can you file
an issue and I'll try and take a look.  Last time I did a benchmark on the
new metrics2 system I was getting a perf boost when compared to the
metrics1 implementation.

1) There are still a few things to move over to metrics2 (rpc)
2) Completely turning metrics off is not possible currently.
On Mon, Nov 26, 2012 at 10:21 AM, Nicolas Liochon <[EMAIL PROTECTED]> wrote:

> Hi All,
>
> I've got an issue related to metrics in HBase trunk.
> I'm trying to create a table with 3000 regions on two regions servers, from
> the shell.
>
> It's ok on a standalone config.
> It's ok on 0.94
> It's not ok on trunk: it fails after around 1 hour.
>
> If I remove all the code related to metrics in HRegion, the 3000 regions
> are created in 3 minutes (twice faster than the 0.94).
>
> When it fails the region server spends its time in "waitForWork", while the
> master is in the tcp connection related code. It's a 1Gb network.
>
> I haven't looked at the metric code itself.
>
> So two questions :-)
> 1) Is there any work in progress on the metrics? I agree that my case makes
> no sense in production, but it's useful for testing (and may be there are
> production uses cases that are impacted as well.)
> 2) Is there any simple way to disable the metrics?
>
> See below the changes I made to HRegion
>
> Cheers,
>
> Nicolas
>
>
> --
>
> index c70e9ab..6677e65 100644
> ---
>
> a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
> +++
>
> b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
> @@ -364,7 +364,7 @@ public class HRegion implements HeapSize { // ,
> Writable{
>    private HTableDescriptor htableDescriptor = null;
>    private RegionSplitPolicy splitPolicy;
>
> -  private final MetricsRegion metricsRegion;
> +  private final MetricsRegion metricsRegion = null;
>
>    /**
>     * Should only be used for testing purposes
> @@ -388,7 +388,7 @@ public class HRegion implements HeapSize { // ,
> Writable{
>      this.coprocessorHost = null;
>      this.scannerReadPoints = new ConcurrentHashMap<RegionScanner, Long>();
>
> -    this.metricsRegion = new MetricsRegion(new
> MetricsRegionWrapperImpl(this));
> +    //this.metricsRegion = new MetricsRegion(new
> MetricsRegionWrapperImpl(this));
>    }
>
>    /**
> @@ -451,7 +451,7 @@ public class HRegion implements HeapSize { // ,
> Writable{
>      this.regiondir = getRegionDir(this.tableDir, encodedNameStr);
>      this.scannerReadPoints = new ConcurrentHashMap<RegionScanner, Long>();
>
> -    this.metricsRegion = new MetricsRegion(new
> MetricsRegionWrapperImpl(this));
> +    //this.metricsRegion = new MetricsRegion(new
> MetricsRegionWrapperImpl(this));
>
>      /*
>       * timestamp.slop provides a server-side constraint on the timestamp.
> This
> @@ -1024,7 +1024,7 @@ public class HRegion implements HeapSize { // ,
> Writable{
>          status.setStatus("Running coprocessor post-close hooks");
>          this.coprocessorHost.postClose(abort);
>        }
> -      this.metricsRegion.close();
> +      //this.metricsRegion.close();
>        status.markComplete("Closed");
>        LOG.info("Closed " + this);
>        return result;
> @@ -2331,11 +2331,11 @@ public class HRegion implements HeapSize { // ,
> Writable{
>        if (noOfPuts > 0) {
>          // There were some Puts in the batch.
>          double noOfMutations = noOfPuts + noOfDeletes;
> -        this.metricsRegion.updatePut();
> +        //this.metricsRegion.updatePut();
>        }
>        if (noOfDeletes > 0) {
>          // There were some Deletes in the batch.
> -        this.metricsRegion.updateDelete();
> +        //this.metricsRegion.updateDelete();
>        }
>        if (!success) {
>          for (int i = firstIndex; i < lastIndexExclusive; i++) {
> @@ -4270,7 +4270,7 @@ public class HRegion implements HeapSize { // ,
> Writable{
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB